noun🔗Share真空，虚空 A region of space that contains no matter."In science class, we learned that vacuums exist in outer space. "在科学课上，我们学到太空中存在真空。spacephysicsastronomyscienceChat with AIVocabulary GamePractice Reading
noun🔗Share吸尘器 (plural only "vacuums") A vacuum cleaner."The store sells vacuums of different brands and prices. "这家商店出售各种品牌和价格的吸尘器。utilitytechnologyutensilmachinedeviceChat with AIVocabulary GamePractice Reading
noun🔗Share真空，虚空。 The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc."a vacuum of 26 inches of mercury, or 13 pounds per square inch"一个相当于26英寸汞柱的真空，或者说每平方英寸13磅的压力差。physicsconditiontechnologymachinescienceChat with AIVocabulary GamePractice Reading
noun🔗Share真空 A spacetime having tensors of zero magnitude"Theoretical physics explores vacuums, regions of spacetime devoid of matter and energy, to understand the fundamental laws of the universe. "理论物理学探索真空，也就是时空中没有任何物质和能量的区域，以此来理解宇宙的基本规律。physicsspacetheoryChat with AIVocabulary GamePractice Reading
verb🔗Share用真空吸尘器清扫，吸尘。 To clean (something) with a vacuum cleaner."She vacuums the living room carpet every Saturday morning. "她每个星期六早上都会用吸尘器清扫客厅的地毯。utilitytechnologymachinedeviceworkactionChat with AIVocabulary GamePractice Reading
verb🔗Share用真空吸尘器清扫，吸尘 To use a vacuum cleaner."Every Saturday morning, my dad vacuums the living room. "每个星期六早上，我爸爸都会用吸尘器清扫客厅。utilitytechnologymachinedeviceserviceactionChat with AIVocabulary GamePractice Reading
verb🔗Share整理数据库, 清理数据库。 To optimise a database or database table by physically removing deleted tuples."The database administrator vacuums the user table every week to improve performance by removing old, deleted accounts. "数据库管理员每周整理用户表，通过移除旧的、已删除的账户来提升性能。computingtechnicalChat with AIVocabulary GamePractice Reading
